What ≚ means
It marks equal corresponding angles. These angles occupy matching positions in both figures, though side lengths may differ.
For triangles, this proves similarity: same shape, possibly different size. Larger polygons can share angles yet differ in shape.
“Equiangle” appears in Sir Henry Billingsley’s 1570 English translation of Euclid’s geometry book Elements; “equiangular” appears in Barrow’s 1660 English edition of Euclid. Those dates are for the words, not the sign’s design.
Don't confuse it with
2Questions people ask
1Why does ≚ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ≚
Windows (Word)
Alt+XType 225A, then Alt+X to get ≚.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “equiangular to”.
Linux
Ctrl+Shift+UType 225a, then Enter or Space.
HTML
≚CSS
\225AUnicode hex input
2026-10-08 — GNOME: Ctrl+Shift+U → 225A → Enter; Word: 225A → Alt+X (French/German Word sometimes Alt+C); macOS: enable Unicode Hex Input, Option+225A.
Codes and encoding1 code points
HTML decimal
≚
HTML hex
≚
CSS content
content: "\225A";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%89%9A
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.